JP2015135392A5

JP2015135392A5 -

Info

Publication number: JP2015135392A5
Application number: JP2014006457A
Authority: JP
Filing date: 2014-01-17
Publication date: 2017-02-09
Anticipated expiration: 2034-01-17

Description

実施形態の投射光学系を組み込んだ投射型画像表示装置の概略構成を示す図である。It is a figure which shows schematic structure of the projection type image display apparatus incorporating the projection optical system of embodiment. 実施例１の投射光学系の断面図である。1 is a cross-sectional view of a projection optical system of Example 1. FIG. （Ａ）〜（Ｆ）は、実施例１の投射光学系の収差図である。 (A) ~ (F) is an aberration diagram of the projection optical system of Example 1. 実施例２の投射光学系の断面図である。6 is a cross-sectional view of a projection optical system of Example 2. FIG. （Ａ）〜（Ｆ）は、実施例２の投射光学系の収差図である。(A)-( F ) are the aberrational figures of the projection optical system of Example 2. FIG. 実施例３の投射光学系の断面図である。6 is a cross-sectional view of a projection optical system of Example 3. FIG. （Ａ）〜（Ｆ）は、実施例３の投射光学系の収差図である。(A)-( F ) are the aberrational figures of the projection optical system of Example 3. FIG.

画像処理部８１は、入力された外部画像信号を各色の階調等を含む画像信号に変換する。なお、画像処理部８１は、外部画像信号に対して歪補正や色補正等の各種画像処理を行うこともできる。 The image processing unit 81 converts the input external image signal to an image signal including a gradation of each color. The image processing unit 81 can also perform various image processing such as distortion correction and color correction on the external image signal.

以上の投射レンズ４０又は投射光学系５２によれば、拡大側の第１群Ｇ１が、正の第１レンズＬ１と第２レンズＬ２とで構成される第１Ａ群Ｇ１−１と、正及び負の接合レンズＬ３，Ｌ４で構成される第１Ｂ群Ｇ１−２とからなるので、長焦点レンズの望遠側特有の収差である球面収差を十分に補正することが可能になる。また、第１群Ｇ１の拡大側の第１Ａ群Ｇ１−１をフォーカス群とすることで、フォーカス機構を簡素化できるとともに、投射レンズ４０をＮ群（計６または７群）構成とし、少なくとも第３群〜第Ｎ−１群を変倍に際して移動させることで、広角端から望遠端までの収差変動を抑えることができる。第２群Ｇ２を２枚の負レンズ、すなわち負の第５レンズＬ５と負の第６レンズＬ６とで構成することにより、周辺光量を確保できかつ、投射レンズ４０又は投射光学系５２に必要なバックフォーカスを十分に確保することが可能になる。 According to the projection lens 40 or the projection optical system 52 described above, the first group G1 on the enlargement side includes the first A group G1-1 including the positive first lens L1 and the second lens L2, and positive and negative. since the cemented lens L 3, the 1B group G1-2 Metropolitan composed of L 4, it is possible to sufficiently correct spherical aberration is telephoto side specific aberrations of the long-focus lens. Further, by making the first A group G1-1 on the enlargement side of the first group G1 into a focus group, the focus mechanism can be simplified, and the projection lens 40 has an N group (total 6 or 7 groups) configuration, and at least first By moving the third group to the (N-1) th group during zooming, it is possible to suppress aberration fluctuations from the wide-angle end to the telephoto end. By configuring the second group G2 with two negative lenses, that is, the negative fifth lens L5 and the negative sixth lens L6, it is possible to secure a peripheral light amount and necessary for the projection lens 40 or the projection optical system 52. A sufficient back focus can be secured.

Claims

A projection optical system comprising a first group to an Nth group provided in order from the enlargement side,
N is 6 or 7,
The first group includes a first A group constituted by two or three positive lenses, and a first B group constituted by positive and negative cemented lenses and provided adjacent to the second group. Consists of
The second group has at least two negative lenses,
During focusing, the first group A is moved along the optical axis,
A projection optical system that fixes at least the first group and the Nth group and moves at least the third group to the N-1th group along the optical axis during zooming.

2. The projection optical system according to claim 1, wherein the second group to the N−1th group are moved along an optical axis during zooming.

The projection optical system according to claim 1, wherein the first group, the second group, and the Nth group are fixed during zooming.

For the lenses in the first group, when the Abbe number of the positive lens of the cemented lens existing in the 1B group is νd1 and the Abbe number of the negative lens of the cemented lens is νd2, the following conditional expression 25 <( νd1−νd2) <50
The projection optical system according to any one of claims 1 to 3, which satisfies:

The second group includes a plurality of negative lenses including the two negative lenses, one of the plurality of negative lenses being a biconcave lens, and the plurality of the plurality of negative lenses existing in the second group Of the negative lenses, when the Abbe number of the negative lens arranged closest to the enlargement side is νd, the following conditional expression 25 <νd <50
The projection optical system according to claim 1, wherein the projection optical system satisfies the following.

When the combined focal length of the first group A and the first group B is f1, and the focal length of the second group is f2, the following conditional expression 1.5 <| f1 / f2 | <4
The projection optical system according to claim 1, wherein the projection optical system satisfies the following.

The projection optical system according to any one of claims 1 to 6, further comprising a lens having substantially no refractive power.

The projection optical system according to any one of claims 1 to 7,
A projection-type image display device comprising: an image-forming optical unit provided in a stage preceding the optical path of the projection optical system.